In the USSR, during the eleven-year period from the death of Joseph Stalin (1953) to the political ouster of Nikita Khrushchev (1964), the national politics were dominated by the Cold War, including the U.S.–USSR struggle for the global spread of their respective socio-economic systems and ideology, and the defense of hegemonic spheres of influence. Since the mid-1950s, despite the Communist Party of the Soviet Union (CPSU) having disowned Stalinism, the political culture of Stalinism — a very powerful General Secretary of the CPSU—remained in place, albeit weakened.